I happen to have some powdered Gatorade in my cube. The ingredients lists; sucrose, dextrose, citric acid, salt, sodium citrate, natural lemon and lime flavor with other natural flavors, monopotassium phosphate, calcium silicate (a flow agent), yellow 6.

edit:
This is for the lemon & lime flavoured version purchased in the US. Don't know about the other flavours or other parts of the globe.